I'm getting the right answer but for some reason its outputting my user inputs as well I'm confused as to why

Question

The following equation estimates the average calories burned for a person when exercising, which is based on a scientific journal article (source):

Calories = ( (Age * 0.2757) + (Weight * 0.03295) + (Heart Rate * 1.0781) - 75.4991 ) * Time / 8.368

Write a program using inputs age (years), weight (pounds), heart rate (beats per minute), and time (minutes), respectively. Output the average calories burned for a person.

Output each floating-point value with two digits after the decimal point, which can be achieved as follows: print('Calories: {:.2f} calories'.format(calories))

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THIS IS MY CODE:

age_years = float(input("Age:"))
#this secures input from user for age in years

weight_lbs = float(input("Weight:"))
#this secures input from user for weight

heart_rate_bpm = float(input("Heart Rate:"))
#this secures heart rate from user 

time_min = float(input("Time:"))
#this secures the time of activity in minutes

calories = ((age_years * 0.2757) + (weight_lbs * 0.03295) + (heart_rate_bpm * 1.0781) - 75.4991) * time_min / 8.368
#this is the formula for figuring average calories burned based on input by user

print('Calories: {:.2f} calories'.format(calories))

THIS IS THE OUTPUT I KEEP GETTING:

Age:Weight:Heart Rate:Time:Calories: 736.21 calories